Telephone-muffler.



W. D. PLUMBQ TELEPHONE MUFFLER.

APPLICATION FILED JAN. 19, 1909;

'l atented Mar. 1, i910.

I/WE/VTOR ATTORNEYS pro Med with .ates use cushion..- seating upon the lip 23 or ll A HILLIAWI D PLUMB, '3 NEiV YORK, N. I.

TELEPI-I Nil-MUFFLER.

Serial no. 4.73.0781

Be it unc-ivn that 1, Va I a citizen of the United dent of the city lilzii'ihetten, in the county and State of Blew York. hiiri i'nvented a new and ln'iprovedf Telephoneiluliler, of which. the "following is e. tull clear, and exactdescription.

'lh's invention relates to teleph ones, and especially to 21 device the purpose of which ILL'LUI D. PLU'MB' Zl i is to increase the distinetness of sound pro- States, and 2i resi oi Xew York. borough of duced by the receiver, the operation of the derice consisting in inuiilling or dampening the sounds \vhichinay be produced sympathetically or otherwise inlhe diaphragm of the transmitter.

The inrention consists in the construction and combination of parts to be more fully described hereinafter and particularly set forth in the claims.

Reference is to be had to the accompanying drawings forming a part of this specificiitioin in which similar ci'iiireeters of reference indicate corresponding ports in all the figures. 'Figurel a perspective showing 1 portion of it IltliJSlIlittQl to which my invention has been applied, this new showing my vice in 1 en condition; Fig. 5 sec tion' throwh the end ot the mouthpiece and showing in device in its closed position; l and. Fig. 8 is plan or tr-on. elevation of the 1 device representin" it opened out and before i being bent to its finished term. i Referri more particularly to the parts, 1 t represents he sound box of a trensn'iitterl having a mouthpiece of the usual bell--- form. that is, the mouthpiece expands tol l ward its outer or lip 3. invention comprises o. ring plate all hu'i'ing an annular body, as indicated most '1 clearly in Fig. The body of this plate is laterally projecting ears which are integral therewith. v The edge of ti control opening 3 through this ring is provided with o. downwardly projecting lip or iiung'e hand a similar.

liiing e or lip 8 is formed on the outer edge of the plate heside of the ring plate is made to form a Wide and shallow groove or sent 9 for a damper ring 10. This damper ring is formed of cloth, blotting paper rubber. or similar soft or fibrous niaterialnot adapted to transmit tween the ears In llliShTflffillQ under i the vibrations, and a material which oper.

sound may pass direetl v cut oh On the edge opposite the hinge '11, the cover i2 is provided vith an outwardly projecting At on side the plate 4 is Patented Mar. 1, 191%..

finger-piece or'handle 1.3, and on the inner.

side of this cover,- a diunpeindislc 14: is attuched. The dampers 10 und seine material, and they may both be attached to their eorrespoi-iding parts by means of a suitable adhesive substance, such as paste, glue, or cement. i prefer to attach them in' this manner for the reason that fitstening devices such as rivets, tend to transniit vibrations, and also may become loose so to present openings through which the a shows the device in which it is when ready for the ears 5 to be bentso thattheyconverge, as shown in Fig 2-. The cars ere. not so prevent the device from being the mouth-piece as shown.

In applying the devicethe ring is applied on the lip 3. as *2, and theeerso are then bent inwardly toward the mouth-piece so that their inner sides conic against the wall of the mouthpiece and act retaining lingers holding the plate in position. i

in order to secure the ears intheir clamping position I provide a keeper ring 5 "h'ich is applied over-the small end of the mouthpiece; T his ring 5 seats on the sides Fig.

plate l the form in close together as to placed over indicated in Fig.

14 are of the of the ears near their ends and the ends of the fingers are then bent outwardly so as to forni'retaining; tips and securing itin position. Vi hen the device is .zipplied in thiswiiy, the damper 10 seats upon the lip and forms sound-proof joint. it ulsofornis a vibration-proof joint on account or the cushioning eiieet of damper 10. When the person telephoning is speekii'ig the cover 12 will beheld open Fy means of the finger-piece 1.3. as indicated in l, but as soon as he ceases 'and begins to receive thetelephoned message, tne cover is held in the elosedposition indiouted in Fig. 9;. 'lfhen the cover is closed in this way. the damper dislr 1st effectually closes'the opening 6 and forms a soundproof and vihratioirproof closure across the mouth of the transinitteiz in this Way the diaphragm of the .trmisniitter is efiectually w from the Y or insuietesfl acoufil' e y This atmosphere around the instrument.

speaking the has the effect of preventing any possible interference by the transmitter from sympathetic vibrations or reflections or sounds producedover the line or in the room where the instrument is placed.

Attentionis called to the construction of the ring plate 4 and to the fact that on account of t he bell-shape of the mouth-piece, thedevice retains itself in position once it has been attached. Furthermore, on account of the great width of the damper ring 10 a single device may be applied to any one of a number of transmitters, although the' diameter of the mouth-piece may be different. The edge of the cover 12 is crimped into a small flange or lip IQ 'WhlCh engages the'edge of thedamper disk 1% and assists in holding it in place.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A mufller for a telephone transmitten having 'a ring plate with a central opening and with outwardly projecting ears adapted to clamp against the outer side of the mouthpiece and forming retaining fingers for said ringplate, a damper ring on the inner side 5 of said ring plate seating against the li) of the transmitter and absorbing sound vi rations tending to pass from said cover to said mouthpiece and to the diaphragm through the opening in said ring plate, and a cover jointed to said ring plate and adapted to close the opening therethrough and insulating the interior of said,v mouth-piece from the surrounding atmosphere.

2. Atelephone mufiler, comprising a rin plate having a central opening therein and having a damper ring on the inner side thereof, means for securing said ring plate to the mouth-piece of a transmitter with said damper ring seating on the lip of the mouth-piece, and a cover jointed to said ring plate and having a damper disk on the inner face thereof adapted to close said opening, and screening the transmitter diaphragm from the vibrations of said cover.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

, NVILLIAM D. PLUMB.

\Vitnesses:

F. D. AMMEN, JOHN P. DAVIS. 

